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Proceedings Paper

Self activated, forced convective cooling in pulsed slab CO2 laser
Author(s): Yoav Sintov; Amnon Gabay; Shaul Yatsiv
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Paper Abstract

A marked improvement is observed in the performance of pulsed microwave excited slab carbon-dioxide laser when the gas is permitted to expand following a discharge pulse. The gas pressure changes following each discharge pulse indicate a heating followed by expansion and contraction stages. A sequence of over ten reciprocating cycles is observed after each pulse. Two modes of operation (open versus closed) were investigated. The gas motion in and out of the discharge space in the open structure, leads to a faster overall cooling than for fully confined gas. Pressure changes driving the reciprocating motion of the activated gas are monitored. Maximum average output power of 20 W with 10% efficiency and about 1 KW peak power were obtained from the open structure at gas pressure of 210 mmHg. The absence of the expansion cooling mechanism in the closed structure caused about 40% reduction in the output power and efficiency. The results of the present research suggest a new architecture for pulsed lasers that provides a gas cooling markedly faster than the conductive cooling of a stagnant gas in the same geometry.

Paper Details

Date Published: 4 April 1997
PDF: 5 pages
Proc. SPIE 3092, XI International Symposium on Gas Flow and Chemical Lasers and High-Power Laser Conference, (4 April 1997); doi: 10.1117/12.270194
Show Author Affiliations
Yoav Sintov, Hebrew Univ. of Jerusalem (Israel)
Amnon Gabay, Hebrew Univ. of Jerusalem (Israel)
Shaul Yatsiv, Hebrew Univ. of Jerusalem (Israel)

Published in SPIE Proceedings Vol. 3092:
XI International Symposium on Gas Flow and Chemical Lasers and High-Power Laser Conference
Denis R. Hall; Howard J. Baker, Editor(s)

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